Which of the following statements are not true?
A) The basis for the choice of a center line for a control chart is sometimes a target value or design specification, for example a desired value of the bearing diameter.
B) An "in-control" process is a process that "meets design specifications or tolerance".
C) An in-control process is simply one whose behavior with respect to variation is stable over time, showing indications of unusual extraneous causes.
D) If the points on a control chart all lie between the two control limits, the process is deemed to be in control.
E) All of the above statements are true.

Question

Quizplus · Accepted Answer

An "in-control" process is not necessarily one that meets design specifications or tolerance. It simply means that the process is predictable and stable with respect to variation, showing no evidence of unusual extraneous causes. Meeting design specifications or tolerance is a separate requirement.

Which of the Following Statements Are Not True